Bug Description

The problem is that Apple's EFI implementation is not conformant to standard UEFI, which is how you'd boot the image. The only thing Ubuntu's +mac releases do is removing the EFI binaries so that the system will switch to BIOS emulation mode.

Documentation describes a tedious manual process, so if we don't want to invest in supporting the fruity non-standard EFI (and for Luna we definitely don't), we'll have to follow in Ubuntu's steps and use EFI-less 64-bit images for Mac.

Fedora seems to be really Mac (EFI) friendly with Intel Macs from as far back as 2006, so if full Mac EFI support would ever be implemented, that would be a place to start. I've had a bit of experience with getting Ubuntu/elementary on old Intel Macs in full EFI mode which was really annoying but I found this to be best of help:https://help.ubuntu.com/community/UEFIBooting .

Having true Mac support requires a secondary partition before the Main Ext4 partition in HFS+ format (non-journalled) that contains a weird folder structure with some Mac specific files as well as GRUB-EFI in order for elementaryOS to be bootable from (Mac) OS X.

you have to set up a boot/efi partition manually while installing. it won't boot afterwards so you have to use boot-repair and choose the separate boot-efi partition in boot-repair's advanced grub options.